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When testing whether we can get the GPU to leak information about non-privileged state, we first need to ensure that the output buffer is set to a known value as the HW may opt to skip the write into memory for a non-privileged read of a sensitive register. We chose POISON_INUSE (0x5a) so that is both non-zero and distinct from the poison values used during the test. v2: Use i915_gem_object_pin_map_unlocked Reported-by: CQ Tang <cq.tang@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: CQ Tang <cq.tang@intel.com> cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Ramalingam C <ramalingam.c@intel.com> Reviewed-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com> Signed-off-by: Karolina Drobnik <karolina.drobnik@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/5cebab02d182c171cf40cb5b73d6c3eeb7619360.1663081418.git.karolina.drobnik@intel.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.